<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>has demo</title>
    <style>
        .test {
            border: 3px inset red;
        }
    </style>
    <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>

<div class="test"><p>Hello in a paragraph</p></div>
<div>Hello again! (with no paragraph)</div>

<script>
    $( "div:has(p)" ).addClass( "test" );
</script>

</body>
</html>